JP2004056563A - Portable telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that a user cannot accurately predict a usable time of a portable telephone set because battery residual quantity display does not take the deterioration of a battery and temperature change into consideration and that the battery is consumed uselessly because data are written to a nonvolatile memory every time the user newly registers data. <P>SOLUTION: A control part 4 updates data showing the residual capacity of the battery for terminal voltage of the battery 6 at any time to accurately calculate the usable capacity of the battery 6 regardless of the deterioration of the battery 6. Furthermore, the usable time is calculated with high accuracy and displayed by taking into consideration a radio wave state and temperature detected by a temperature detecting part 7. The control part 4 collectively backs up user data to a nonvolatile internal memory (flash memory) 4a to reduce power consumption used for backup, thereby extending the usable time. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to display of usable time and backup of user data in a mobile phone driven by a battery.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. H11-55372 discloses that in a mobile phone, data of usable time (communicable time and standby time) with respect to a battery terminal voltage is stored in a ROM in advance, and the mobile phone corresponding to the remaining battery power is stored. There has been disclosed a technique for obtaining and displaying a usable time of a telephone from a measured value of a battery terminal voltage. According to this technique, the usability is improved as compared with the case where the remaining battery level for a fully charged state is displayed in several levels according to the battery terminal voltage.
[0003]
On the other hand, in a mobile phone, user data such as communication parameters, voice memos, telephone directories, and mail data are generated. These user data are temporarily registered in a volatile memory such as a DRAM or an SRAM, and then backed up in a nonvolatile memory such as a flash memory.
[0004]
Japanese Patent Application Laid-Open No. 2000-78070 discloses a technology in which a user data backup destination in a mobile phone is set to a memory backup center (for example, a wireless base station) on a mobile communication network. According to this technology, by backing up user data periodically, necessary data can be obtained from the network by another mobile phone even if the mobile phone is lost, thereby improving usability.
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional usable time display technology, since the data stored in the ROM in advance is used, if the characteristics of the battery change due to the deterioration or temperature change of the battery, an accurate usable time is calculated. I couldn't get it.
[0006]
In addition, if the user data is backed up frequently as described above, the battery is wasted. For example, if the backup destination is a flash memory, only writing in block units is allowed, so even if the data that needs to be rewritten is 1 byte, writing is performed only in units of tens of bytes, for example. And writing power for several tens of bytes is consumed. Therefore, if a backup operation to the flash memory is performed every time new user data is registered, the battery is extremely consumed and the usable time is shortened.
[0007]
A first object of the present invention is to accurately calculate and display the usable time of a mobile phone.
[0008]
A second object of the present invention is to suppress battery consumption due to a backup operation of user data in a mobile phone, thereby extending the usable time.
[0009]
[Means for Solving the Problems]
In order to achieve the first object, the mobile phone according to the first aspect of the present invention calculates the usable time of the mobile phone while updating data indicating the remaining capacity of the battery with respect to the terminal voltage of the battery as needed. And a display unit for displaying the calculated available time. As a result, the state of deterioration of the battery is reflected on the remaining capacity data as needed, so that the calculation accuracy of the usable time is improved.
[0010]
According to the second aspect of the present invention, the apparatus further includes a temperature detector for detecting a temperature near the battery, and the controller further has a function of correcting the remaining capacity data according to the detected temperature. As a result, the temperature near the battery is reflected on the remaining capacity data at any time, so that the accuracy of calculating the usable time is further improved.
[0011]
In the invention according to claim 3, the control unit further has a function of calculating a usable time of the mobile phone based on a magnitude of a battery current required according to a radio wave state of the mobile phone. . As a result, a more accurate usable time reflecting the radio wave state of the mobile phone can be obtained.
[0012]
Further, a mobile phone according to a fourth aspect of the present invention is a mobile phone, comprising: a control unit for measuring a terminal voltage and a current of a battery; a terminal for notifying the measured terminal voltage and the current to an external device; A transmitting / receiving unit for receiving a notification of the usable time of the mobile phone calculated while updating data indicating the remaining capacity of the battery with respect to the voltage as needed, and a display unit for displaying the notified usable time. It is to be prepared. As a result, the state of deterioration of the battery is reflected on the remaining capacity data as needed, so that the calculation accuracy of the usable time is improved. In addition, since the operation of calculating the usable time is performed by an external device, the power consumption of the mobile phone itself can be reduced.
[0013]
The invention according to claim 5, further comprising a temperature detection unit for detecting a temperature near the battery, wherein the transmission and reception unit is configured to correct the remaining capacity data by the external device according to the detected temperature. A function of notifying the detected temperature to the external device is further provided. As a result, the temperature near the battery is reflected on the remaining capacity data at any time, so that the accuracy of calculating the usable time is further improved.
[0014]
In the invention according to claim 6, the transmission / reception unit calculates the usable time of the mobile phone in the external device based on a magnitude of a battery current required according to a radio wave state of the mobile phone. And a function of notifying the external device of the radio wave state of the mobile phone. As a result, a more accurate usable time reflecting the radio wave state of the mobile phone can be obtained.
[0015]
On the other hand, in order to achieve the second object, the mobile phone according to the seventh aspect of the present invention controls the mobile phone so that the frequency of the user data backup operation is reduced according to the remaining usable capacity of the battery. And a control unit for performing the operation. By reducing the frequency of the backup operation of the user data, the consumption of the battery is suppressed, so that the usable time is extended.
[0016]
In the invention according to claim 8, the control section has a function of postponing the backup operation when the available capacity of the battery is sufficiently larger than the capacity required for the backup operation. Thereby, the backup of the user data is performed collectively, and the consumption of the battery is suppressed.
[0017]
The portable telephone according to the ninth aspect of the present invention is configured such that a backup destination of the user data can be selected from an internal memory of the portable telephone, a home memory for managing subscriber information, and an external memory other than the home memory. It was done. This further improves the usability of the mobile phone.
[0018]
In the invention according to claim 10, the control unit further has a function of searching and deleting unnecessary data in the user data when the remaining memory capacity of the backup destination of the user data is insufficient. As a result, it is possible to prevent a situation in which backup is not performed because the remaining memory capacity is insufficient and necessary data is lost.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 shows a configuration example of a mobile phone according to the present invention. The mobile phone 1 of FIG. 1 includes an antenna 2, a transmission / reception unit 3, a control unit 4, a display unit 5, a battery 6, and a temperature detection unit 7. The transmitting and receiving unit 3 modulates an output signal of the control unit 4 and transmits the modulated signal via the antenna 2, and also demodulates a signal input from the antenna 2 and supplies the demodulated signal to the control unit 4. The control unit 4 calculates standby time of the mobile phone 1 and backs up user data, in addition to controlling standby and talking. The control unit 4 has a nonvolatile internal memory 4a as one of backup destinations of the user data, in addition to a volatile memory in which the user data is temporarily registered. The internal memory 4a is, for example, a flash memory. The display unit 5 displays the information such as the telephone number input from the control unit 4 and also displays the usable time calculated by the control unit 4. The battery 6 supplies power to the entire mobile phone 1. The temperature detector 7 detects a temperature near the battery 6 and supplies a signal representing the temperature to the controller 4. Further, a nonvolatile external memory 8 is detachably connected to the control unit 4. This external memory 8 is another one of the backup destinations of the user data.
[0021]
FIG. 2 is a conceptual diagram of a mobile communication network using the mobile phone 1 of FIG. In FIG. 2, reference numeral 10 denotes a wireless line, and 11 denotes a wireless base station. Reference numeral 12 denotes a mobile communication control station, which controls a plurality of radio base stations 11. A common channel signal network 13 connects the mobile communication control stations 12 to each other. A home memory 14 manages subscriber information of many mobile phones. The home memory 14 can be used even when the subscriber having the mobile phone 1 moves into the area of any of the radio base stations 11, and is another one of the backup destinations of the user data.
[0022]
Now, the battery 6 in FIG. 1 has a threshold voltage Voff that determines whether the battery 6 is usable. When the terminal voltage V of the battery 6 becomes the threshold voltage Voff, the capacity of the battery 6 slightly remains. However, when the terminal voltage V of the battery 6 falls below the threshold voltage Voff, the terminal voltage V sharply drops, and there is a possibility of overdischarging, so that this capacity cannot be used. That is, when the terminal voltage V of the battery 6 reaches the threshold voltage Voff, the battery 6 cannot supply the voltage, and the capacity of the battery 6 used until the terminal voltage V of the battery 6 becomes the threshold voltage Voff is reduced. This is the usable capacity. Generally, the usable capacity of the battery 6 changes due to deterioration and temperature change.
[0023]
FIG. 3 shows an example of a characteristic change caused by the deterioration of the battery 6. The solid line indicates the terminal voltage / use capacity characteristic when no deterioration occurs, and the usable capacity is Q1. The dashed line shows the characteristics when slight deterioration occurs, and the usable capacity is Q2. The dashed line indicates the characteristic when severe deterioration occurs, and the usable capacity is Q3. Here, Q1>Q2> Q3, and the usable capacity of the battery 6 decreases as the deterioration progresses.
[0024]
FIG. 4 shows an example of a characteristic change caused by a temperature change of the battery 6. The solid line indicates the terminal voltage / use capacity characteristic at room temperature, and the usable capacity is Q4. The dashed line indicates the characteristic at low temperature, and the usable capacity is Q5. Here, Q4> Q5, and the usable capacity of the battery 6 is lower at low temperatures than at normal temperature.
[0025]
Hereinafter, the usable time display and the backup of the user data in the mobile phone 1 of FIG. 1 will be sequentially described in detail. The user data backup destination can be appropriately selected from the internal memory 4a, the external memory 8, and the home memory 14.
[0026]
FIG. 5 is a flowchart of a process in the control unit 4 when calculating the usable time in the mobile phone 1 of FIG. 5 is a step of measuring the terminal voltage V (n) and the current I (n) of the battery 6. 101 is a step of calculating the used capacity ΔQ (n) (= I (n) × t) for each unit time t. Here, the unit time t is the time required to return to step 100 again. 102 is a step of calculating the remaining capacity Q (n) (= Q (n−1) −ΔQ (n)) of the battery 6. Reference numeral 103 updates data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 and corrects the data using the voltage change rate k of the battery 6 according to the temperature detected by the temperature detection unit 7 (see FIG. 4). The result of step 103 is shown in FIG. Note that V (0) and Q (0) in FIG. 6 are initial values immediately after the battery 6 is charged.
[0027]
In FIG. 5, reference numeral 104 denotes a threshold voltage Voff of the battery 6 at which the battery 6 becomes unusable, based on temperature-corrected data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 recorded last time. The threshold remaining capacity Qoff is obtained, and the remaining usable capacity Q of the battery 6 is obtained. ^* This is the step of calculating (n) (= Q (n) -Qoff). 105 is an available time T (n) (= Q ^* (N) / I). At this time, the necessary current I is obtained from the display mode (standby, call, mail reception, mail transmission, Internet connection, etc.) and the current radio wave state. FIG. 7 shows a current table referred to in step 105. The backup mode in FIG. 7 will be described later.
[0028]
Reference numeral 106 in FIG. 5 is a step of outputting the usable time T (n) to the display unit 5. Thereafter, the operation from step 100 to step 106 is repeated.
[0029]
As described above, according to the processing of FIG. 5, the data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 in the mobile phone 1 is updated as needed, so that the available time of the mobile phone 1 It is possible to accurately calculate and display T (n).
[0030]
Instead of the mobile phone 1 in FIG. 1, the wireless base station 11 in FIG. 2 can also execute the process of calculating the usable time.
[0031]
FIG. 8 is a flowchart of a process in the control unit 4 of the mobile phone 1 when the usable time is calculated in the wireless base station 11 in FIG. 8 is a step of measuring the terminal voltage V (n) and the current I (n) of the battery 6. 201 outputs the measured terminal voltage V (n) and current I (n) of the battery 6, the temperature detected by the temperature detecting unit 7, and the radio wave state of the mobile phone 1 to the transmitting / receiving unit 3, Is notified to the wireless base station 11. Step 202 is a step for determining whether or not the transmission / reception unit 3 has received the usable time T (n) calculated by the wireless base station 11. 203 is a step of outputting the usable time T (n) to the display unit 5 when it is determined in step 202 that the usable time T (n) has been received. Thereafter, the operation from step 200 to step 203 is repeated.
[0032]
FIG. 9 is a flowchart of a process in the wireless base station 11 when calculating the usable time in the wireless base station 11 in FIG. 9, reference numeral 300 denotes terminal voltage V (n) and current I (n) of the battery 6 transmitted by the mobile phone 1, temperature detected by the temperature detection unit 7, and information on the radio wave state of the mobile phone 1. This is the step of receiving Steps 301 to 305 are steps corresponding to steps 101 to 105 in FIG. However, data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 is recorded in the home memory 14. 306 is a step of transmitting the usable time T (n) to the transmitting / receiving section 3 of the mobile phone 1.
[0033]
As described above, according to the processing in FIGS. 8 and 9, the data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 recorded in the home memory 14 is updated as needed. It is possible for the station 11 to accurately calculate the usable time T (n) and to display it on the display unit 5 of the mobile phone 1.
[0034]
FIG. 10 is a flowchart of a process performed by the control unit 4 when the mobile phone 1 of FIG. 1 performs a backup process of user data. Steps 400 to 404 in FIG. 10 correspond to steps 100 to 104 in FIG. Reference numeral 405 denotes a step of calculating a battery capacity Qbackup (= Ibackup × Tbackup) necessary for backing up user data. At this time, the current Ibackup and the time Tbackup required for the backup are obtained based on whether the backup destination of the user data is the internal memory 4a, the home memory 14, or the other external memory 8, and the current radio wave state. The magnitude of the required current in each backup mode for a certain radio wave state is as shown in FIG.
[0035]
406 in FIG. 10 indicates a remaining usable capacity Q of the battery 6. ^* This is a step of judging whether (n) is sufficiently larger than the capacity Qbackup necessary for performing backup. 407 is the remaining available capacity Q of the battery 6 ^* This is a step of performing a user data backup operation when (n) becomes substantially equal to the required backup capacity Qbackup. In step 406, the remaining usable capacity Q ^* If it is determined that (n) is sufficiently large, the backup operation is postponed, the process returns to step 400, and the operations from step 400 to step 406 are repeated. As described above, the control unit 4 controls the remaining available capacity Q of the battery 6 so that the consumption of the battery 6 is suppressed. ^* Control is performed so that the frequency of backup work of user data is reduced according to the size of (n).
[0036]
FIG. 11 is a detailed flowchart of step 407 of the backup operation in FIG. Reference numeral 500 in FIG. 11 is a step for determining whether to perform backup in the internal memory 4a, the home memory 14, or the external memory 8. In step 501, when it is determined in step 500 that backup is to be performed in the internal memory 4a, it is determined whether the remaining capacity of the internal memory 4a is equal to or larger than the capacity of user data (backup data) to be backed up. 502 is a step of outputting the backup data to the internal memory 4a when it is determined in step 501 that the remaining capacity of the internal memory 4a is equal to or larger than the capacity of the backup data. Step 503 is a step of deleting unnecessary data in the internal memory 4a when it is determined in step 501 that the remaining capacity of the internal memory 4a is smaller than the capacity of the backup data. The process of deleting unnecessary data in the internal memory 4a will be described later in detail. Reference numeral 504 denotes a step of determining whether backup is possible. If it is determined that backup is possible, backup data is output to the internal memory 4a in step 502. Step 505 is a step of outputting a message indicating that backup is impossible to the display unit 5 when it is determined in step 504 that backup is not possible.
[0037]
Reference numeral 506 in FIG. 11 is a step for determining whether to perform backup using the home memory 14 or the external memory 8 when the backup is determined not to be performed in the internal memory 4a in step 500. Step 507 is a step for determining whether the remaining capacity of the external memory 8 is equal to or larger than the capacity of the backup data when it is determined in step 506 that the backup is to be performed in the external memory 8. Step 508 is a step of outputting the backup data to the external memory 8 when it is determined in step 507 that the remaining capacity of the external memory 8 is equal to or larger than the capacity of the backup data. In step 509, when it is determined in step 506 that the remaining capacity of the external memory 8 is smaller than the capacity of the backup data, it is determined whether the data in the external memory 8 may be deleted. 510 is a step of deleting the data in the external memory 8 when it is determined in step 509 that the data in the external memory 8 may be deleted. Step 511 is a step of determining whether backup is possible. If it is determined that backup is possible, the backup data is output to the external memory 8 in step 508. A display unit 512 displays a message indicating that backup is not possible when it is determined in step 509 that data in the external memory 8 is not to be deleted or when it is determined in step 511 that backup is not possible. This is the step of outputting to Step 513 is a step of outputting the backup data to the transmission / reception unit 3 when it is determined in step 506 that the backup is performed in the home memory 14. The backup data output to the transmission / reception unit 3 is transmitted to the home memory 14 and stored.
[0038]
FIG. 12 is a detailed flowchart of the unnecessary data deletion step 503 in FIG. In FIG. 12, reference numeral 600 denotes a step of determining whether a plurality of the same telephone numbers are registered. Step 601 is a step of, when it is determined in step 600 that a plurality of the same telephone numbers are registered, leaving only one and deleting the rest. Step 602 is a step of determining whether the remaining capacity of the internal memory 4a is equal to or larger than the capacity of the backup data. If it is determined in step 602 that the remaining capacity of the internal memory 4a is equal to or larger than the capacity of the backup data, the processing for deleting unnecessary data in the internal memory 4a is terminated. Step 603 is a step of determining whether there is any mail transmission history that has not been saved when it is determined in step 602 that the remaining capacity of the internal memory 4a is smaller than the capacity of the backup data. Step 604 is a step of deleting the unsaved mail transmission history when it is determined in step 603 that there is an unsaved mail transmission history. As a result, unnecessary data in the internal memory 4a is deleted. If it is determined in step 603 that there is no transmission history of the unsaved mail, the processing for deleting unnecessary data is ended. As described above, according to the processing in FIG. 12, when the remaining capacity of the internal memory 4a is insufficient, unnecessary data in the user data is searched and deleted. It is possible to secure.
[0039]
Instead of the mobile phone 1 in FIG. 1, the wireless base station 11 in FIG. 2 can execute the backup determination processing.
[0040]
FIG. 13 is a flowchart of a process in the control unit 4 of the mobile phone 1 in a case where the wireless base station 11 in FIG. Reference numeral 700 in FIG. 13 denotes a step of measuring the terminal voltage V (n) and the current I (n) of the battery 6. 701 outputs the measured terminal voltage V (n) and current I (n) of the battery 6, the temperature detected by the temperature detection unit 7, and the radio wave state of the mobile phone 1 to the transmission / reception unit 3, and outputs them. This is a step of notifying the wireless base station 11. Step 702 is a step for determining whether or not the transmission / reception unit 3 has received the “continuous usable information” transmitted by the wireless base station 11. If it is determined in step 702 that the continuously usable information has been received, the process returns to step 700, and the operations from step 700 to step 702 are repeated. Step 703 is a step of determining whether or not the transmission / reception unit 3 has received the “backup command” transmitted by the wireless base station 11 when it is determined in step 702 that the continuously usable information has not been received. If it is determined in step 703 that the backup command has not been received, the process returns to step 702. Step 704 is a step of performing a backup operation when it is determined in step 703 that a backup command has been received. Details of the backup operation are as shown in FIGS.
[0041]
FIG. 14 is a flowchart of a process in the radio base station 11 when the radio base station 11 in FIG. 2 performs the backup determination process of the user data. Steps 800 to 804 in FIG. 14 correspond to steps 300 to 304 in FIG. Data indicating the remaining capacity Q of the battery 6 with respect to the terminal voltage V of the battery 6 is recorded in the home memory 14. Steps 805 to 806 in FIG. 14 correspond to steps 405 to 406 in FIG. 807 in FIG. 14 indicates a remaining usable capacity Q of the battery 6. ^* This is a step of transmitting a backup command to the transmission / reception unit 3 of the mobile phone 1 when (n) becomes substantially equal to the required backup capacity Qbackup. 808 is the remaining available capacity Q in step 806. ^* When (n) is determined to be sufficiently large, the step of transmitting the continuously usable information to the transmission / reception unit 3 of the mobile phone 1 so that the backup operation is postponed.
[0042]
In the process of deleting unnecessary data in the internal memory 4a, in FIG. 12, although the same telephone number is registered in plurals, the deletion is performed in the order of the unsaved mail transmission history. Can be changed.
[0043]
【The invention's effect】
As described above, according to the present invention, the available time is calculated while updating the data indicating the remaining capacity of the battery with respect to the terminal voltage of the battery as needed, and the result of the calculation is displayed. The usable time of the telephone can be accurately calculated and displayed. If the temperature near the battery is reflected in the remaining battery capacity data, the accuracy of calculating the usable time is further improved. In addition, if the magnitude of the battery current required according to the radio wave condition of the mobile phone is taken into consideration, a more accurate usable time can be obtained.
[0044]
Further, according to the present invention, the control is performed such that the frequency of the backup operation of the user data is reduced according to the remaining usable capacity of the battery, so that the consumption of the battery due to the operation is suppressed. As a result, the usable time of the mobile phone is extended.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a mobile phone according to the present invention.
FIG. 2 is a conceptual diagram of a mobile communication network using the mobile phone of FIG.
FIG. 3 is a diagram showing an example of a characteristic change caused by deterioration of the battery in FIG.
FIG. 4 is a diagram illustrating an example of a characteristic change caused by a temperature change of the battery in FIG.
FIG. 5 is a flowchart of a process in a control unit when calculating a usable time in the mobile phone of FIG. 1;
FIG. 6 is a diagram illustrating a result of a step of updating and correcting data of terminal voltage and remaining capacity of the battery in FIG. 5;
FIG. 7 is a diagram showing a current table referred to in a usable time calculation step in FIG. 5;
8 is a flowchart of a process in a mobile phone control unit when calculating a usable time in a wireless base station in FIG. 2;
9 is a flowchart of a process in the radio base station when calculating a usable time in the radio base station in FIG. 2;
FIG. 10 is a flowchart of a process in a control unit when a backup process of user data is performed by the mobile phone of FIG. 1;
FIG. 11 is a detailed flowchart of steps of a backup operation in FIG. 10;
FIG. 12 is a detailed flowchart of a step of deleting unnecessary data in an internal memory in FIG. 11;
13 is a flowchart of a process in a mobile phone control unit when a backup determination process of user data is performed in the wireless base station in FIG. 2;
14 is a flowchart of a process in the wireless base station in the case where the wireless base station in FIG. 2 performs a backup determination process for user data.
[Explanation of symbols]
1 mobile phone
2 Antenna
3 transceiver
4 control unit
4a Internal memory
5 Display
6 batteries
7 Temperature detector
8 External memory
10 wireless lines
11 wireless base stations
12 Mobile communication control station
13 Common line signaling network
14 Home Memory

Claims (10)

A battery-powered mobile phone,
A control unit for calculating the usable time of the mobile phone while updating the data indicating the remaining capacity of the battery with respect to the terminal voltage of the battery as needed,
A display unit for displaying the calculated usable time. The mobile phone according to claim 1,
Further comprising a temperature detector for detecting the temperature near the battery,
The mobile phone according to claim 1, wherein the control unit further has a function of correcting data indicating the remaining capacity according to the detected temperature. The mobile phone according to claim 1,
The mobile phone according to claim 1, wherein the control unit further has a function of calculating an available time of the mobile phone based on a magnitude of a current of the battery required according to a radio wave state of the mobile phone. A battery-powered mobile phone,
A control unit for measuring the terminal voltage and current of the battery,
Notifying the measured terminal voltage and current to an external device, and calculating the available time of the mobile phone calculated while updating the data indicating the remaining capacity of the battery with respect to the terminal voltage of the battery in the external device as needed. A transmitting / receiving unit for receiving a notification;
A display unit for displaying the notified usable time. The mobile phone according to claim 4,
Further comprising a temperature detector for detecting the temperature near the battery,
The portable device further comprises a function of notifying the external device of the detected temperature so that the data indicating the remaining capacity is corrected by the external device according to the detected temperature. Phone. The mobile phone according to claim 4,
The transmitting and receiving unit is configured to calculate an available time of the mobile phone based on a magnitude of a current of the battery required in accordance with a radio wave state of the mobile phone by the external device. A mobile telephone further comprising a function of notifying the external device of a radio wave state. A battery-powered mobile phone,
A mobile phone, comprising: a control unit for controlling the frequency of user data backup work in accordance with the remaining usable capacity of the battery. The mobile phone according to claim 7,
The mobile phone according to claim 1, wherein the control unit has a function of postponing the backup operation when the available capacity of the battery is sufficiently larger than the capacity required for the backup operation. The mobile phone according to claim 7,
A mobile phone characterized in that a backup destination of the user data can be selected from an internal memory of the mobile phone, a home memory for managing subscriber information, and an external memory other than the home memory. The mobile phone according to claim 7,
The mobile phone according to claim 1, wherein the control unit further has a function of searching for and deleting unnecessary data in the user data when the remaining memory capacity of the backup destination of the user data is insufficient.

Images